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數(shù)控機床熱誤差補償中分布滯后模型的建立
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國家自然科學基金資助項目(51175142);浙江省自然科學基金資助項目(Y1110407)


Establishment of Autoregressive Distributed Lag Model in Thermal Error Compensation of CNC Machine Tools
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    摘要:

    針對數(shù)控機床熱誤差補償建模中溫度敏感點選擇及模型建立問題,提出用模糊聚類法和灰色關聯(lián)法結合選擇溫度敏感點,用分布滯后模型建立補償模型的方法。根據(jù)機床關鍵點溫度和熱誤差的實驗數(shù)據(jù),分別建立熱誤差的多元線性回歸模型和分布滯后模型。在一臺Leaderway V—450型數(shù)控加工中心上進行熱誤差建模實驗,測量主軸分別在2000、4000、6000r/min下的熱誤差及溫度,結果表明分布滯后模型的擬合精度優(yōu)于多元線性回歸模型,用任一轉(zhuǎn)速下的實驗數(shù)據(jù)建模時,分布滯后模型的穩(wěn)健性低于多元線性回歸模型,而綜合任意兩個轉(zhuǎn)速下的實驗數(shù)據(jù)建模時,分布滯后模型的穩(wěn)健性略優(yōu)于多元線性回歸模型。利用分布滯后模型建立的預測模型在數(shù)控機床熱誤差補償中具有實用性。

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    Due to the problems of temperature-sensitive point selection and model establishment in the modeling of CNC machine tools thermal error compensation, the method was presented by combined with fuzzy clustering and grey correlation to select temperature-sensitive points and the autoregressive distributed lag was used to establish model. According to the experimental data of machine temperature and thermal error, multiple regression model and autoregressive distributed lag model were built respectively. The modeling test of thermal error was designed on the Leaderway V-450 CNC machining center, the thermal error and temperature data were measured on the conditions of the spindle speed in 2000, 4000 and 6000r/min. The result showed that fitting accuracy of distributed lag mode was better than that of multiple regression model, robustness of distributed lag mode was lower than that of multiple regression model when experimental data of any spindle speed was used to modeling, but the robustness of distributed lag mode was prior to multiple regression model when experimental data of any two spindle speeds were used to modeling. Application of autoregressive distributed lag model for CNC machine tools thermal error prediction can be useful.

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姚煥新,牛鵬程,龔亞運,邵善敏,苗恩銘.數(shù)控機床熱誤差補償中分布滯后模型的建立[J].農(nóng)業(yè)機械學報,2013,44(3):246-250. Yao Huanxin, Niu Pengcheng, Gong Yayun, Shao Shanmin, Miao Enming. Establishment of Autoregressive Distributed Lag Model in Thermal Error Compensation of CNC Machine Tools[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(3):246-250.

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  • 在線發(fā)布日期: 2013-02-25
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